Nicolas Goaziou <mail@nicolasgoaziou.fr> writes:

> Rainer M Krug <Rainer@krugs.de> writes:
>
>> Right - that works. But Why do the others have B_ names, while this
>> environment has BMCOL?
>
> "BMCOL" is a terrible name. However, it is not an environment per se
> since it controls both "columns" and "column" environments.


To quote from the Beamer Manual (emphasis added):

12.7 Splitting a Frame into Multiple Columns:

,----
| The *main environment for creating columns* is called columns. Inside
| this environment, you can either place several *column environments*,
| each of which creates a new column, or use the \column command to
| create new columns.
`----

But I think you are referring to BMCOL. This adds the :BEAMER_col:
property, which is converted on export to the column environment with
the given width, i.e. the same as B_column plus the width in
PROPERTIES. As far as I see, it does nothing with the columns
(B_columns) environment - or am I missing something here?

>
> There is a use-case for handling "columns" independently on "BMCOL"
> (i.e., add specific options to the environment). I'm not so sure about
> "column". There might be the same reason.

I don't think one can use B_columns without specifying the width
in :PROPERTIES: and nothing stops me to add additional PROPERTIES in the
BMCOL property. 

Rainer

>
> Regards,

-- 
Rainer M. Krug
email: Rainer<at>krugs<dot>de
PGP: 0x0F52F982